Moiré flat Chern bands and correlated quantum anomalous Hall states generated by spin-orbit couplings in twisted homobilayer MoS_{2}
We predict that in a twisted homobilayer of transition-metal dichalcogenide MoS_{2}, spin-orbit coupling in the conduction band states from ±K valleys, can give rise to moiré flat bands with nonzero Chern numbers in each valley. The nontrivial band topology originates from a unique combination of an...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-03-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.L012032 |
| Summary: | We predict that in a twisted homobilayer of transition-metal dichalcogenide MoS_{2}, spin-orbit coupling in the conduction band states from ±K valleys, can give rise to moiré flat bands with nonzero Chern numbers in each valley. The nontrivial band topology originates from a unique combination of angular twist and local mirror symmetry breaking in each individual layer, which results in unusual skyrmionic spin textures in momentum space with skyrmion number S=±2. Our Hartree-Fock analysis further suggests that density-density interactions generically drive the system at 1/2-filling into a valley-polarized state, which realizes a correlated quantum anomalous Hall state with Chern number C=±2. Effects of displacement fields are discussed with comparison to nontrivial topology from layer-pseudospin magnetic fields. |
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| ISSN: | 2643-1564 |